Bath scale



FIG. 1 is a perspective plan view of the bath scale design;

FIG. 2 is a top plan view;

FIG. 3 is a front view;

FIG. 4 is a side view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a rear view.

The broken line showing is for illustrative purposes only and forms nopart of the claimed design.

The ornamental design for a bath scale, as shown.